參數(shù)資料
型號(hào)： MC13109
廠商： Motorola, Inc.
英文描述： Universal Cordless Telephone Subsystem IC
中文描述： 通用無繩電話子系統(tǒng)集成電路
文件頁數(shù)： 23/28頁
文件大?。?/td> 395K
代理商： MC13109
MC13109
23
MOTOROLA ANALOG IC DEVICE DATA
Auxiliary Register
The auxiliary register contains a 3–bit 1st LO Capacitor
Selection latch and a 4–bit Test Mode latch. Operation of
these latch bits are explained in Figures 28, 29 and 30.
Figure 28. Auxiliary Register Latch Bits
3–Bit 1st LO Capacitor
Selection
4–Bit Test Mode
MSB
LSB
MSB
LSB
First Local Oscillator Capacitor Selection for 25
Channel U.S. Operation
There is a very large frequency difference between the
minimum and maximum channel frequencies in the proposed
25 Channel U.S. standard. The sensitivity of the 1st LO is not
large enough to accommodate this large frequency variation.
Fixed capacitors can be connected across the 1st LO tank
circuit to change the 1st LO sensitivity. Internal switches and
capacitors are provided to enable microprocessor control
over internal fixed capacitor values. Figure 29 shows the
schematic of the 1st LO tank circuit. Figure 30 shows the
latch control bit values.
The internal varactor temperature coefficient is 1800 ppm/
°
C
(CO = 8.9 pF at 25
°
C, Vcap control voltage = 1.2 V, Freq =
36 MHz). Customer is suggested to use a negative
temperature coefficient capacitor in 1st LO tank circuit when
the whole operating temperature range of –40 to +85
°
C is
considered.
Figure 29. 1st LO Schematic
LO1 In
40
LO1 Out
41
Vcap Ctrl
42
Internal Capacitor
1st LO
Varactor
Varactor
Cext
Lext
áááááááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááá
á
á
ááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááá
Figure 30. 1st LO Capacitor Select for U.S. 25 Channels
áá
áá
Bit 2
áááááááááááááááááááááááááááááá
á
Bit 1
á
áá
0
0
0
1
1
0
1st LO
Bit 0
áá
áá
0
1
á
á
Select
áá
áá
0
0
1
0
1
0
á
á
áá
áá
16 – 25
1
2
3
á
á
Channels
ááá
ááá
16 – 25
1 – 6
7 – 15
–
4
–
á
á
Varactor)
0.92 pF
0.92 pF
2.61 pF
1.82 pF
8.69 pF
7.19 pF
á
Cap. Value
(Excluding
á
Range
10 – 6.4 pF
10 – 6.4 pF
10 – 6.4 pF
10 – 6.4 pF
10 – 6.4 pF
10 – 6.4 pF
27 pF
27 pF
33 pF
33 pF
Value over
0.5 to 2.2 V
á
Capacitor
Value
á
27 pF
33 pF
External
á
á
ááá
ááá
Value
0.47
μ
H
0.47
μ
H
á
á
0
0
–
0
0
–
0
1 – 6
7 – 15
–
0.47
μ
H
0
–
0.47
μ
H
0.47
μ
H
0.47
μ
H
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